Science Fair Project Encyclopedia
Elara (moon)
| Discovery | |||||||
|---|---|---|---|---|---|---|---|
| Discovered by | C. D. Perrine | ||||||
| Discovered on | January 2 1905 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 11,716,000 km | ||||||
| Eccentricity | 0.155-0.272 | ||||||
| Orbital period | 259.1d | ||||||
| Inclination | 1.4-46.7° | ||||||
| Is a satellite of | Jupiter | ||||||
| Physical characteristics | |||||||
| Mean diameter | 86 km | ||||||
| Surface area | km2 | ||||||
| Mass | 8.7×1018 kg | ||||||
| Mean density | 2.6 g/cm3 | ||||||
| Surface gravity | 0.031 m/s2 | ||||||
| Rotation period | ~0.5d | ||||||
| Axial tilt | ?° | ||||||
| Albedo | 0.03 | ||||||
| Surface temp. |
| ||||||
| Atmospheric pressure | 0 kPa | ||||||
Elara (ee-lair'-a or ee'-lur-a, IPA or /'i:lərə/, Greek Ελάρη) is a moon of Jupiter. It was discovered by Charles Dillon Perrine at Lick Observatory in 1905 and is named after the mother by Zeus of the giant Tityus.
Elara did not receive its present name until 1975; before then, it was simply known as Jupiter VII. It was sometimes called "Hera".
It belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.
External links
- Harvard College Observatory Bulletin, 178 (1905) 1
- Publications of the Astronomical Society of the Pacific, 17 (1905) 62
- Astronomische Nachrichten, 169 (1905) 43/44
... | Lysithea | Elara | S/2000 J 11 | ...
Last updated: 07-13-2005 16:43:22
12-19-2008 14:25:18
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details